Yes! We will run a post campaign pledge manager for a limited window, which will allow backers to add new items after the campaign ends. There is nothing wrong with waiting to make your decision until later, but every dollar pledged in this campaign will help the project grow, attracting new backers and helping to unlock more awesome content for everyone.
This includes upgrading pledge levels and selecting add-ons. For example, if you're in for a $1 now you may choose to upgrade to to the "Mystic" level later with no penalty for waiting.